Automatic centrifugal glassware-making machinery.



B. F. GIFT.

AUTOMATIC CENTRIFUGAL GLASSWARE MAKING MACHINERY.

iAPPLiCATION FILED SEPT. 9. 191 5.

' 1,1 90,1 45. Patented July 4, 1916.

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Patenfed July 4, 1916.

B F. GIFT.

APPLICATION FILED SEPT 9| 19 15.

WITNESSES ra f/ B. F. GIFT.

AUTOMATIC QENTRIFUGAL GLASSWARE MAKING MACHINERY. APPLICATION F ILEDSEPT. 9. 1915.

1 1 90, 1 45. Patented July 4, 1916.

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B. F. GIFT.

AUTOMATIC CENTRIFUGAL GLASSWARE MAKING MACHINERY.

APPLICATION FILED SEPT. 9, I915.

1,1 90,1 45. Patented July 4, 1916.

5 SHEETS-SHEET 5.

BAA 4 6E/IR/A/6 f/ C 5 (My finja vm'nl T g ff A TTORNEIS BENJAMINFRANKLIN GIFT, OF DUNKIRK, INDIANA.

AUTOMATIC CENTRIFUGAL GLASSWARE-MAKING MACHINERY.

Application filed September 9, 1915. Serial 170.49,?29.

To all whom it may concern Be it known that I, BENJAMIN F. GIFT, a.citizen of the United States, residing at Dunkirk, in the county of Jayand State of Indiana, have invented certain new and useful Improvementsin Automatic Centrifugal Glassware-Making Machinery, of which thefollowing is a specification.

My invention relates to the art ofmaking glassware by the utilization ofthe action of centrifugal force .andconsists .in the construction andoperation of parts hereinafterde'scribed and claimed.

The principal object of my invention is to provide a machine for shapingmolten glass into Ware of various shapes by the action of centrifugalforce and to turn the shaped glass-ware out in a finished state.

Another object. is to provide an intermittently rotatable mold carryingtable on which independently revoluble molds are mounted. Suitablemechanism operates the table and molds at such predetermined times thata batch of molten glass when deposited in a mold, is carried throughvarious stages of formation until it finally assumes the shape of thefinished ware. It is then discharged from the mold at the place ofdelivery and taken oif by an attendant.

Another object is to provide an interchangeable molding ring. Thisringis seated on the brim of a mold during certain stages of theformation of the glassware. It is then remove? by the attendant andplaced on the brim o the mold in advance of the one from which it wasremoved for a purpose to be explained.

-Another object is to provide a blank plunger which is adapted tomomentarily contact with the batch of molten glass so as to chill thecenterand set the heft from which the surrounding molten glass spreadsto' form the article in formationby the action of the mold in itssubsequent stages of operation.

Another object is to provide shears which co-act with the blank plunger.The purpose of the shearsis to cut the glass from the punty after theglass has been dropped into the mold.

Another object liesv in the provision of mechanism for operating-thedevice by hand.

' Such an instance, mayoccur'whenit is desired to make an initial trialof the mold. At such time it isdesi'r'able to temporarily dispense withthe mechanical motive power.

Specification of Letters Patent.

Patented July 4, 1916.

With other objects in view which shall hereinafter be made apparent theconstrucillustrated in the accompanying drawlngs in which- Flgure 1 is aperspective view of the de vlce, Fig. 2 is a front elevation, a partbeing broken away. Fig. 3 is a plan. Fig. i is a section on line 44' onFig. 3. Fig. 5 is a detail section on line 55 on Fig. 4. Fig. 6 is adetail section on line 66 on Fig. 5. Fig. 7 is a section on line 77 onFig. 3. Fig. 8 is a detail view of the mutilated gear wheel. thechangeable speed sprocket. Fig. 10 is a section of one of the molds.Fig. 11 is a cross section on line 1111'on Fig. 10. Fig.

12 is a detail section of one side of one of the molding rings. Fig. 13isa vertical section showing the application of a jointed mold. Fig. 14is a plan view of the stud plate. Fig. 15 is an inverted plan view ofthe divided mold. Fig. 16 is a cross section on line 16l6 on Fig. 13.

Attention is now directed to Fig. 1 of the drawings, in which 1designates a base on which the molding mechanism is mounted. The base 1carries axles 2 on which wheels 3 are mounted and render the base 1 andits carried mechanism, easily portable. Secured to the base 1 andcentrally thereof, is a fixed standard 4 which, as shown in Fig.4, maybe hollow so as to lighten it. The standard 4 is provided with avertically extended dove-tailed groove 5 at one side in near itsperiphery w th a ball-race 8. Bearing balls 9 are placed in the race 8and support an intermittently rotatably mold carrying table 10. Thetable 10 has a central aperture 11 in which the hub 12 of the standard 4is located. This structure insures a steady and even motion of the table10, when it rotates. The table 10 is'pro vided on its under side with abevel-gear 13 (see Fig. 4). Arranged at suitable intervals near theperiphery of the table 10 and adjacent to the gear 13, are circularapertures 14 in each of which a bearing sleeve 15 is rotatably mounted.The sleeve 15 has an annular collar at the top and'is provided with aball race on the under side.

Fig. 9 is a detail sectional view of.

Bearing balls'lfioare located in the race formed in the collar of thesleeve 15, and a similar race in the upper face of a boss 17 which is apart of the table and through which the aperture 14 also passes (seeFigs. 4 and 10) The sleeve 15 has a central bore in which a shaft 18 isreciprocatably mounted. The shaft 18 has a longitudinally extended key19 at one side which fits into a key-slot which is in turn milled in thebore of the sleeve 15. The key and slot permit the vertical movement ofthe shaft 18 at certain times and also serve to turn the bearing sleeveP5 with the shaft 18. Detachably secured to the collar of the sleeve 15is a mold 20 which is of that shape to which it is desired to mold theglass-ware. In this instance it is of a nappy. The mold 20 has a centralvalve seat 21 in which a valve 22 is seated The valve 22 is formed onthe shaft 18 and closes the seat 21. At the time when the article ofglass-ware is completely formed in the mold 20, the shaft-valve islifted and in so doing, raises the glass nappy out of'the mold when itcan be taken off by an attendant. The mold 20 is slowly revolved on itsaxis at times and at other times is rapidly revolved. This isaccomplished through the medium of the pinion 23 mounted on the shaft 18near the bottom thereof. The key 19 serves to hold the pinion in place.The centrifugal force generated by the rotation of the mold-20, acts onthe molten glass batch within the mold and causes it to spread upwardlyor outwardly on the sides and thus form the article. The ring 24 seatson the brim of the mold 20 and forms the abutment which. limits theupward or outward flow of the molten glass under the centrifugal actionof the rotating mold. The ring 24 has an annular groove 24 which closelyfits on the correspondingly shaped brim of the mold. The ring 24 isremoved by the attendant after the formed glass article is chilled, andplaced on a similar mold 20 in advance of the one from which the ring isremoved. There are five molds employed in this form of my invention, andfour rings. After the ring 24 is removed, the molded glass article isfree to be lifted from the mold 20 as before explained. The moldcarrying table 10 is intermittently rotatable and at such times when itcomes to rest, the table is held by a latch 25 which engages an opening26 in the under face of the table. The opening 26 has a grooved approachso that the latch 25 is admitted gradually (see Fig. 7) The latch 25 ispivoted at 27 to the casting 7 (see Fig. .4 also) and has a downwardlyextended heel 28 which is engaged and lifted at the time when the table10 is about to be again rotated. The weight of the heel 28" keeps thelatch 25 in contactwith' the under face of the table 10.

Mounted in suitable bearings 29 on the base 1, is a drive shaft 30 onwhich a pulley 31 is keyed. A belt 32 takes over the pulley 31 and overa smaller pulley 33 on the shaft of a motor 34, which drives themechanism. The drive shaft 30 is extended at one side and is providedwith another pulley 35 whereby the mechanism may'be operated from anoverhead line shaft. Such an instance may occur when it is desired tooperate a plurality of molding machines at one time, and at such a timethe motor 34 is dispensed with. A bevel bear 36 is mounted in theopposite end of the-shaft 30, (see Fig. 1) and meshes with a pinion 37which is keyed to the lower end of a vertical shaft 38. The shaft 38 issuitably mounted in a bearing 39 which is supported from the centralstandard 4. to the upper end of the shaft 38 and serves a purposepresently to be explained. Mounted on the end of the base 1 adjacent tothe shaft 38, is a gear segment support 41 on the upper end of which asegmental gear 42 is fixedly secured. The pitch line of the gear 42which radiates from the center of the standard 4, coincides with thepitch line of the adjacent gear the object in this arrangement beingpresently made clear.

I Fig. 3 shows the pinion 23 on the shaft 18 as just having engaged thesegmental gear 42. A charge of molten glass is deposited into the mold20 at this place. As the table rotates, the mold is also rotated byreason of the engagement of the pinion 23 with the gear 42. As soon asthe pinion leaves the segmental gear 42 it is engaged by the gear 40 andin order that the interlocking'of the gear teeth may readily beeffected, the pitch lines of the two gears 42 and 40 must coincideradially.

Mounted in a bearing 43 on the standard 4, (see Figs. 1 and and in abearing 44 on a bracket 45, is the counter-shaft 46. The shaft 46 isprovidedwith a large sprocket 47, at one end over which a chain 48takes. The chain isdriven by a sprocket pinion 49 on the drive shaft 30which pinion is composed ofthree sets of teeth each set being of adifferent pitch diameter so that the desired one may be engaged by thechain 48 when it is desired to alter the speed of rotation of the shaft46. The bracket has an upwardly extending bearing arm (see Fig.

2) in Which is mounted a plunger operating shaft 50. The shaft 50 isprovided with a bevel gear 51 at its end nearest the standard 4, and isprovided with a spur gear 52 at its opposite end. Secured to the outerend of the shaft 46, i'sa mutilated gear wheel 53 (see Fig. 2). Y Thewheel 53 has a bevel gear 54 whichmccupies approximately ofthe rim ofthe wheel, the remainder thereof being blank. When the gear surface 54en gages the bevel gear 13 on thetable 10, then A spur gear 40 is keyeda trip 55 which is adapted to strike against the heel 28-of the latchand move it on its pivot 27 and thus retract the latch 25 from y theopening 26 in the under face of the table. The table is then free torotate. Located in advance of the gear segment 54, and at the side ofthe wheel 53, is an internal spur-gear 56." The gear 56 is arranged at alesser distance from the center of the wheel 53, than is the bevel gear54, and the quadrant 56 is adapted to engage the spur gear 52. When thisoccurs, the slide 6 in the standard 4, is lowered. A rack 57 is formedon the lower end ofthe slide 6, (see Fig. 4) and is constantly engagedby the bevel pinion 51 on the shaft 50 but the shaft 50 does not rotateuntil the quadrant 56 engages the pinion 52 on the shaft 50, at whichtime the shaft 50'is rotated and the slide 6 is lowered in consequence.The shaft 50 is supported at its end adjacent to the pinion 51, in..an.extension of the bearing 43 (see Fig. 3).

A laterally extended arm 48 (see Fig. 4)

formed with the slide 6, is provided with. an internally threaded boss49. The threaded shank of a blank plunger .60 -is located in the boss 49and-held in place by a check-' nut. The plunger may be adjustedvertically by turning the head 61 after having loosened the check nut.The plunger 60 is adapted to make a rapid descent after a batch ofmolten glass has been deposited in the mold 20 directly under it, theplunger arm 48 and pluhger 60 being located at the place Where themoldsare charged withmolten glass in sequence. The purpose of the above actin will. be hereinafter made plain. A colla 62 is secured to the standard4 and the collar has an opening 63 adjacent to the slide 6. enough topermit the movement of the slide 6 therein and also that of a chain 64.The chain 64 is secured to the slide 6 at .a place beneath the table 10and runs over an idler 65 which is mounted on the. collar 62. The chain64 is then secured to the retractor arm 66 of the shears mechanism. Thecollar 62 has a rounded forward extension 67 around which .a stoutspring 68 is coiled. The spring 68 abuts the base of theextension 67 andthe retractor 'head 69 and tends to push the head 69 forwardly. Securedto the extension 67 is the central arm of av shears guide 70. The shearsguide comprises parallel arms 71 and 72, (see Fig. 5) which converge asat 73 at their forward ends and unite with the arm which supports them.

The arm 70 is notched at a place near its base as at 74 to permit theentrance of the The opening 63 is large properly chilled.

end of a pivoted latch 75, (see Fig. 6).

Mounted in a bracket on the retractor head 69, is a bell-crank 76. Thebell-crank 76 is pivotally secured to the outer end of the latch and isweighted at its other end as at 77, the purpose of the weight being tokeep the latch in contact with the arm 70.

An arm 78, secured to the collar 62 (see .Fig. 1) supports a trip lever79 which has an inwardly turned end 80. The outer end of the trip lever79 is bent at right-angles as at- 81 and forms a convenient tappingplacefor the attendant. The inwardly turned end 80 of the trip lever restsagainst the under side of the bell-crank 76 and when the attendantwishes to release the latch 75 from the notch 74, he taps the end 81 ofthe trip lever 79 with his punty or other convenient instrument whichthus releases the latch 75 from the notch 74 and the head 69 may thenspring forwardly.

The arm 66 is turned down as at 82 and forms a bearing support for theblades 83 of an automatic shear. Each blade'83 is extended rearwardlybeyond the pivot 82 and which are forced into contact with the adjacentarms 71 and 72 by a spring 85 which is interposed between the heels 84.The spring spreads the blades 83 of the shear.

lVhen the trip 75 is released, the head 69 and the shear blades carriedthereby, spring forwardly being thus impelled by the coil spring 68.lVhen the heels 84 engage the converging portions 73 of the arms 71 and72, the shear blades are forced together and cut the molten glass fromthe operators unty with which the glass is deposited in t 1e mold. Theoperator or gatherefi touches the trigger 81 at the moment he wishes theglass cut. This occurs just before the plunger 60 lowers into the mold.The slide 6 and its carried parts is returned to its normal positionafter the pinion 52 disengages the gear 56 by a spring 86 which isconnected to the top of the slide 6 and to an arm 87 (or any other fixedpart) The nozzles 90 are placed in a suitable position so that the airmay be blown on the newly formed glass article so that it, may beMounted on one end of the base 1- is a support 91 on which a track 92 ismounted. The track 92 is bent downwardly at the; ends so that therounded ends of the valve shafts 18 may easily' ascend and descend asthey come into position. This track 92 raises the shafts 18 and liftsthe finished glass articles from the molds 20.

The track '92- is adjustable. The standard or support 9101? the track92, is divided at the center, the lower part 99 forming the ba e of thesupport. The base 99 is provi ed with bolts 100. The standard 91 isprovided with a slot 101 into which the bolts 100 project. Whenthe boltnuts are tightened, then the standard 91 becomes fixed but when the nutsare loosened, then the standaid and track 92 may be lowered. The trackis lowered at times, for a purpose about to be explained.

Figs. 13 et seq. illustrate a modification in the mold structure whereina provision is made for the use of a jointed mold instead of a block orsolid mold, as in the preceding figures of the drawings.

, In order to adapt the glass-molding machine to the usef'of jointedmolds, .the valve 22 shown in Fig.110, is removed. In this case, thevalve 22 is unscrewed. A studplate 102 is screwed on the end of theshaft 18, in place of the valve 22; the plate 102 is screwed down untilit grips the sleeve 15 tightly so that it will not become loosened bythe vibration of the machine. The plate 102 1 has a plurality of shortstuds 103 which are The studs 103 hold the mold 20 in place during therotation of the mold. When the hold has passed through the variousstagesof its, travel and reaches'the placeof discharge of the formed glassblank from the mold, then the mold is opened by the at tendant and theglass blank -is removed. When jointed molds are used in my machine, thetrack 92 is lowered so that it will not obstruct the passage of theprojecting shafts 18. In the block form of mold, the contact of the endof the shaft 18 with the'track 92 raised the glass blank from the mold.Since the. modified jointed mold does not require this last namedoperation,the track is lowered out of the way, as explained. Pivoted tothetable 10 near the :periphery' thereof and adjacent to each of'the'molds 20, is a One end of the bell-crank has an upwardly extendedhandle 94 while bell-crank 93.

the other end is provided with a 'latch'95. The bell-crank 93 is held inone direction by a spring96. 4 4 When it is desiredto operate themolding mechanism by hand the wheel 53 is loosened andslipped back onits shaft 46. The

latches 95 are adapted to engage the forked upper end 97 of a fixed bar98, under the above condition, and the latches 95 will hold the table 10to its position. These hand released locks are used when the operatordesires to try out the molds and may be swung back in any suitablemanner out of the way of the forked end 97 so that the normal operationof the device is not interfered with.

Having thus described my. device, theoperation is as follows: The makingof finished glass-Ware by my device is accomplished in one operationwhich comprises 5 steps. The first step is to deposit a batch of moltenglass into the mold 20 at the place marked charge in Fig. 1. This isdone by the operator who takes a quantity of molten glass on his puntyand drops the glass into the mold. As he holds the punty over the mold,he lightly touches the trigger 81, thus releasing the head 69, of theshears mechanism, and the shears 83 are caused to spring forwardly andclose, thereby cutting the glass from the punty. The table 10 remainsstationary during this'performance and the pinion 23 onthe shaft 18 isin engagement with the segmental gear 42.

Immediately after the batch of molten .glass is deposited into the mold20, the

quadrant 56 will intermesh with the gear 52 on the shaft 50 and theslide.6 which carries the blank plunger 60 will be rapidly lowered intothe mold. The plunger, then contacts the molten glass and in chillingthe center heft. is set from which the surrounding molten glass spreadsto the edge pf the mold during the subsequent operations. As the plunger60 descends, the chain'65 which is connected to the slide 6 at oneendand the retractor head 69 at the other end, will pull the block 69rearwardly and withdraw the shears 83 from the path of the downwardlymoving plunger 60. The shears are re-set. in this manner, for the nextoperation. After the gear 52 hasbeen transversed by vthe quadrant 56,the gear,

is released therefrom and the spring pulls the slide 6 up and retractsthe blank plunger 60 from the mold. Shortly after .the quadrant 56leaves the gear 52, the trip 55 releases the latch 25 from the opening26 in the, table 10. The table 10 is then free to rotate. a

The second step in the formation of the glass article occurs when thesegmental bevel gear 54 engages the annular bevel gear 13 on' the table10., This causes the table to rotate and since the pinion 23 on theshaft18 is in intermesh with the fixed gear segment 42, the shaft 18 and mold20 w ll be revolved at a moderate speed. This initial rotary motion ofthe mold prevents vthe glass from flowing to the center. I

The third step occurs after the pinion 23 has traversed the stationarygear segment me 42. As soon as the pinion 23 leaves the gear 42, itimmediately intermeshes with the rapidly revolving gear 10. The shaft 18and mold 20 are now rapidly rotated and themolten glass is caused tospread or flare up the side of the mold until the ring 24 on the brim ofthe mold is reached; The table 10 is at rest during. the abovecentrifugal operation since the latch 25 comes into engagement withanother opening 26 in the table directly after the pinion 23 disengagedthe gear 42. I

The fourth step brings the mold 20 to a position under the air nozzle90, where the glass article is cooled. Here an attendant removes thering 2-1 from the brim of the mold 20 and places it on the mold just inadvance of the charging position.

The fifth step consists in raising the article out of the mold. This isaccomplished when the shaft 19 ridesupon the track 92 which causes thevalve 2:? to be raised, lifting the glass article with it. The articleis now in its finished state, and has the polished surface and smoothedges which is now gotten only by laborious and costly processes. Theraised article is now set off by the attendant. The next movement ofthetable 10 allows the valve 18 to ride off of the track 92 and the mold isnow in that position where, it will receive the ring 24 from that moldnow under the cooling nozzle.

The machine operates continuously while the motor 34 is running and eachmovement is performed whether the molds contain a batch of molten glassor not. V

I claim 1. In a centrifugal glass molding machine, a base, a standardmounted on said base, a rotatable table mounted on said standard, acentrifugal mold carried by said table to receive a batch of glass,means for chilling the center of the batch to form a heft, and means forrevolving said mold during certain stages of the rotation of the tablewhereby to cause the glass to flow upwardly on the sides of the moldfrom the said heft.

2. In a centrifugal glass molding machine, a base, a standard mounted onsaid base, a rotatable table mounted on said standard, a centrifugalmgold carried by said table to receive a batch of glass, means forchilling the center of the batch to form a heft, and means forrevolvingsaid mold at different speeds successively during certain stages of therotation of the table to.

cause flow of the glass upwardly in the mold away from the said heft.

3. In a centrifugal glass molding machine, a' base, a standard mountedon said base, a stationary gear segment supported from said base, aconstantly revolving gear adjacent to the stationary segment, a rotatingtable mounted on the aforesaid standard, a centrifugal mold carried bysaid table to receive a batch of glass, said mold-having a dependentshaft and a pinion mounted on said shaft, a chilling plunger movableinto the mold centrally of the batch of glass to form a heft, and meansfor bringing the mold carried pinion into engagement with the stationarysegment and the revolving gear successively, for the purpose described.

4. In a centrifugal glass molding machine, a portable base, astandardmounted on said base, a rotatable table mounted on [said standard, astationary gear segment supported from the base and positioned beneathsaid table, a constantly revolving gear adjacent to the stationarysegment and in an equal plane therewith, a centrifugal mold carried bythe rotatable table to receive a batch of glass, said mold having ashaft downwardly dependent through said table, a

pinion mounted on said shaft and disposed in an equal plane with theaforesaid stationary segment and revolving gear, a chilling plungermovable into the mold centrally of the batch of glass to form a heft,and means for rotating the table so as to bring the mold carried pinioninto successive intermeshing engagement with the stationary segment andrevolving gear.

In a glass molding machine, abase, a standard mounted on said base, anintermittently rotatable table mounted on said standard, a stationarygear segment sup ported from the base and positioned beneath said table,a constantly revolving gear adjacent to the stationary segment thepitchv lines of the segment and gear being in radial coincidence, a.mold carried by the totatable table, said mold having a shaft extendingdownwardly through the table, a pinion mounted on said shaft said pinionbeing adapted to engage the stationary-segment and the. revolving gearsuccessively as the table rotates, and means for intermittently:rotating. the table.

6. In a glass molding machine, a base, a standard mounted 'on said base,an intermittently rotatable table mounted on said standard, a moldcarried by the rotatable table said mold having a shaft extendingdownwardly through the table and a pinion mounted on said shaft, astationary gear segment supported, from the aforesaid base andpositioned in an equal plane with the base, a drive-shaft mountedthereon, means for rotating the drive-shaft, a standard mounted on saidbase, a counter-shaft supported on said standard, said counter-shaftbeing driven from said drive-shaft, a table mounted on the aforesaidstandard, said tablehaving an annular bevel gear on the undersidethereof, a centrifugal mold carried by said table to receive a batch ofglass, I

a mutilated gear mounted on the aforesaid counter-shaft adapted to meshwith the annular table-carried bevel gear intermittent-1y, a chillingplunger movable into the mold centrally of the batch of glass to form aheft, and means for revolving said mold at different speeds insuccession at certain stages of the intermittent rotation of the table.

8. In a glass molding machine, a portable base, a drive-shaft mountedthereon, means for rotating the driveshaft, a standard mounted on saidbase, a counter-shaft supported on said standard, said counter-shaftbeing driven from said drive-shaft, a table mounted on the aforesaidstandard, said table having an annular bevel gear on the undersidethereof, a mold carried by the rotatable table said mold having a shaftextending downwardly through the table and a pinion mounted onsaidshaft, a stationary gear segment supported from the aforesaid base andpositioned in an equal plane with the aforesaid pinion, a vertical shafthaving a gear, said gear being positioned adjacent to the stationarysegment and having its pitch line in radial coincidence with the'pitchline of the gear segment, said vertical shaft'being driven by theaforesaid drive-shaft, said mold carried pinion being adapted to bemoved into engagement with the stationary segments and revolving gearsuccessively as the aforesaid mutilated gear engages the annulartablecarri'ed gear.

9. Ina glass molding machine, a base, a standard mounted on said base, arevolving table mounted on said standard, a stationary .gear segmentbeneath said table, a rapidly revolving gear adjacent to the stationarygear segment, molds carried by the aforesaid table, said molds havingpinions positioned in an equal. plane with the segment and gear,

'11. In a glass molding machine, a base, a standard mounted on saidbase, arevolving table mounted on said standard, a mold carried by saidtable, a counter-shaft supported on said standard beneath the table, amutilated gear wheel mounted on said countershaft, means cooperativewith the wheel for lowering the blank plunger into the mold, and meansfor retracting the blank plunger from the mold.

12. In a glass molding machine, a base, a standard mounted on said base,a revolving table mounted on said standard, a mold carried by saidtable, a counter-shaft supported on said standard beneath-the table, a.mutilated gear wheel mounted on said countershaft, means cooperativewith the wheel for lowering the blank plunger into the mold, and meansfor retractingthe blank plunger from the mold, said means comprising aspring. 7

13. In a glass molding machine, a base, a standard mounted on said base,said standard having avertical slot, a slide mounted in said slot, saidslide having a rack, a blan'k plunger carried by said slide, a revolvingtable mounted on said standard, a mold carried by said table, acounter-shaft supported on the aforesaid standard beneath the revolvingtable, a quadrantmounted on said counter-shaft, a plunger operatingshaft, said shaft having a pinion at one end adapt ed to engage theaforesaid slide rack, and a gear mounted on the other end of the plungeroperating shaft, said gear being located in the path of the-aforesaidquadrant.

14. In a glass molding machine, a portable base, a drive-shaft mountedthereon, means for rotating the drive-shaft, a standard mounted on saidbase, a countershaft supported on said standard, said counter-shaftbeing driven from said drive-shaft, said standard having a verticalslot, a revolving table mounted on said standard, a mold carried'by saidtable, a slide mounted in said slot, said slide having a rack, ablankplunger carried by said slide, a plunger operatingshaft'mounted adjacentto the counter-shaft,

said counter-shaft having a quadrant, a pinion mounted on the plungeroperating shaft adapted to constantly mesh with the slide rack, a gearmounted on the opposite end of the plunger operating shaft, said gearbeing engaged by the quadrant, intermittently to lower the blank plungerslide into the mold and a spring secured to the plunger slide to retractthe plunger from the mold when the quadrant and gear disengage.

15. In a glass molding machine, a portable base, a drive-shaft mountedthereon, means for rotating the drive-shaft," a standard mounted on saidbase, a counter-shaft suported onfsaid standard,'said counter-shaft eingdriven from said drive-shaft, a rotatable table mounted on saidstandard, said table having an annular bevel gear on its under face, amold carried by said table, a casting mounted on the standard beneaththe table, said table having notches in its under face, a latch pivotedon the casting, said lat ch being adapted to engage one of said notches,sa1d latch having a heel, a mutilated gear mounted on the aforesaidcounter-shaft,

and a tripmounted on the mutilated gear in advance of the teeth thereof,said trip being adapted to engage the aforesaid latch heel to releasethelatch from the table notch.

16. In a glass molding machine, a base carrying a standard, mounted onsaid standard, a mold carried by said table, a support secured to thestandard, a bar secured to said support and hav-' ing a guide, a headslidableon said bar, a spring interposed between the head and thesupport, shear blades supported by said head and engaging said guide andmovable with the former to closed position, a latch normally holding thehead retracted against the pressure of thespring and supporting saidshears in open position, and means for releasing the latch andpermitting closing movement of the shears in said guide and with saidhead.

17. In combination with the mold of a glass molding machine, a shearing'device mounted on a support above said mold, said device comprising abar secured to said support, said bar having a notch, a head slidable onsaid bar, a spring interposed between the head and the support, parallelframe members disposed at either side of said bar, said frame membershaving converging front ends, shear blades supported by said head, saidshears having heels engaging the aforesaid parallel frame members, alatch pivoted on the aforesaid head adapted toengage the notch in thebar when the head is retracted, and a manually operated triggerfor.releasing the latch from the notch when the shears are to be closed.

18. In combination withthe mold, of a glass molding machine, a supportcarrying a head and positioned above said mold, said,

support having a notch, a spring interposed between the head and thesupport, shear blades=supported from the head, said blades havingdownwardly turned heels, a frame arranged parallel to the aforementionedsupport, said frame having converging front ends, a coil springinterposed between the heels of the shear blades, adapted to contact theheels with the parallel frame, a latch pivoted on the aforesaid headadapted a rotatable table to engage the notch in the support when thehead is retracted, a manually operated trigger for releasing the latchfrom the notch so as to project and close the shear blades,

ed boss, said arm being attached to said slide, a blank plungeradjustably stationed 1n said threaded boss, a rack located on theaforesaid slide, a pinion engaging said rack adapted to lower the slideat times, a shearing device attached to said standard, and means forretracting and opening the shear blades actuated by the loweringof theplunger slide.

20. In a glass molding machine, a base, a standard mounted on said base,an intermittently rotatable table carried by 'said standard, a moldcarried by said table, -means for initially rotating the mold at anormal rate of speed, other means for subsequently rotating the mold ata high rate, and means wherebythe speed of rotation of the table and theinitial rotation of the mold may be varied. a

21. In a centrifugal glass machine, an intermittently rotating tablehaving a receiving station, a plurallty of centrifugal molds spacedapart around said table andeaoh of means for slowly rotating each of themolds as it leaves the receiving station upon m1- tial rotation of thetable, and means for imparting speedy rotation to each mold when thenext successive mold is at the receivin station.

22. n a centrifugal glass machine, a mold having an upwardly andoutwardly flaring wall provided with a limiting ring around its upperend, means for chilling the central portion of amass of,molten glassdlsposed in said mold whereby to form a heft, and means for rotatingsaid mold with 1ts axis in a vertical position during such rotationwhereby to force the molten glass from around the heft upwardly alongthe mold Wall to said limiting ring by the centrifugal force of suchrotation. v

BENJAMIN FRANKLIN GIFT. Witnesses: I

' CHARLES M. HIGMAN, CHARLES E. LEAsUnE.

' which receives glass at the receiving station,

